# PPT_CHAPTER_5_BMS

#### Slide_1: Battery Management System (BMS)

* BMS is a part of the battery pack's intelligence.
* A battery management system is an electronic device that manages a rechargeable battery.
* Some of its functions are
Preventing the battery from operating beyond its safe operating area
tracking its status
Measuring secondary data and reporting that data,
managing, authenticating and regulating its environment.
* Each model will have an exclusive BMS that is suited for that particular application based on number of series cells, current rating and other parameters.

#### Slide_2: Working Principle

* When the battery pack is connected to load such as a motor or electronic circuitry electrical current is drawn from the battery pack.
* The current from each series link, however, may not be of the same magnitude resulting in an unbalanced state.
* This unbalanced state can create major problems for battery pack charging.
* This further affects the balanced battery pack state.
* Hence, Battery Management System ( BMS) is used to prevent these instances.

#### Slide_3: Functions

* Monitoring individual cells which form the battery pack and maintaining its operating conditions.
* Shielding the cells from tolerance limits.
* Monitoring the conditions of individual cells which form the battery pack.
* State of Charge (SOC) and State of Health (SOH) information of the battery are measured.
* Some BMSs have thermal protection feature.
* Few expensive BMSs include features such as Bluetooth connectivity.

#### Slide_4: Architecture

Credits: http://erbug.boapu.hapolo.mohammedshrine.org/lithium-battery-management-system-wiring-diagram.html

#### Slide_5: How to choose a BMS?

1. Voltage Rating
The voltage rating is usually mentioned in the form of the number of series in the battery pack.

2. Current rating
BMS with suiable nominal current and peak current rating is selected based on the load parameters.

#### Slide_6: Wiring the BMS

There are three main connections,

1. C- [C minus]: This port is the charger connector.
2. B- [Battery minus]: The first set of the battery pack’s negative terminal is connected to this port.
3. P- [Pack minus]: Discharge Connector, which is internally connected to the Battery pack minus.
(Note: B- & P- are same ports)

Fig: 10S BMS connection